Search results

==Unusual authigenic minerals==

...expect, as well as what [http://dictionary.reference.com/browse/authigenic authigenic] clays might be present, can help us predict permeability. ==Effect of authigenic clays==

...ermeabilities is the occlusion of interstitial pore throats by detrital or authigenic clays or cement (see [[Rock-water reaction: formation damage]]). Thus, a pr ...verage permeabilities, and thus poor reservoir quality, to the presence of authigenic or detrital clays or cements.<ref name=pt06r82>Masters, J. A., 1984, Elm wo

...ess horizontal and usually cuts across stratigraphic units. It forms where authigenic minerals (usually calcite) fill the pore spaces. The '''bottom seal''' of r

| Small pores mainly between detrital or authigenic clays; can also occur within grains (e.g., microporous [[chert]]) ...ion or cementation.<ref name=pt06r158>Wilson, M. D., Pittman, E. D., 1977, Authigenic clays in sandstones—recognition and influence on reservoir properties and

...re::90&deg;C]]). Evidently, this temperature influences the development of authigenic materials. Quite possibly the zone of mineralization stays near the [[tempe

...ause it is difficult to estimate the relative abundance of detrital versus authigenic clay without thin section or scanning electron microscope data, care must b ...The existence of microporosity is suggested by the presence of detrital or authigenic clays in sandstones. Accurate laboratory or thin section determinations of

* Authigenic kaolinite

Injected water can also cause authigenic clays in the pores to swell and/or migrate. Injected water may react with i

...such as radiolarians, sponge spicules provides the major silica source for authigenic quartz formation that is favorable for both porosity preservation and britt

...ng the rock framework normally have little impact on rock-fluid reactions. Authigenic clays, however, line, fill, or bridge pores. They are exposed to extraneous Chemically initiated fines migration occurs when authigenic clays are contacted by fluid that

...ng the rock framework normally have little impact on rock-fluid reactions. Authigenic clays, however, line, fill, or bridge pores. They are exposed to extraneous Chemically initiated fines migration occurs when authigenic clays are contacted by fluid that (1) has an inadequate total cation (Na<su

* authigenic http://dictionary.reference.com/browse/authigenic

...] [[quartz]] grains and [http://dictionary.reference.com/browse/authigenic authigenic] [[quartz]] overgrowths (cement) in sandstones.<ref name=pt05r80>Houseknech ...e, or discrete grains. [ http://dictionary.reference.com/browse/authigenic Authigenic] clay cements commonly precipitate as grain coatings, pore fillings, and gr

...ted in shales: AAPG Getting Started 20, 1198 p.</ref>. Where the resulting authigenic crystals are very small (< 2 μm), it may be difficult to unequivocally dif ...form and origin of each compositional component (e.g., detrital, biogenic, authigenic; [[:File:M126-MudstoneNom-Figure1.jpeg|Figure 1C]]). Examination of polishe

...ists as small pores (less than 2 μm) commonly associated with detrital and authigenic clay minerals. Dissolution porosity is the pore space formed from the parti

...e/detrital detrital] or [http://dictionary.reference.com/browse/authigenic authigenic] clays (very common) || Identify and map reservoir facies with the least de